January Weather in Sasayama, Japan

Last updated: August 23, 2025

In January, the average temperature in Sasayama, Japan hovers around 4°C (40°F), with a minimum of -6°C (21°F) and a maximum reaching 16°C (60°F). Expect about 46 mm (1.8 in) of precipitation spread over 7 days, contributing to a notably high average humidity of 82%.

January Temperature in Sasayama

In January in Sasayama, the average temperature is 4°C (40°F). Maximums can reach 16°C (60°F), while minimums can drop as low as -6°C (21°F). This range makes Sasayama a destination for travelers seeking both chilly days and milder afternoons, so pack accordingly!

January Weather in Sasayama: Daily Temperature Highs, Lows, and Averages

The chart illustrates January temperature patterns in Sasayama, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sasayama, January typically has an average temperature of 4°C (40°F), with highs reaching up to 16°C (60°F) and lows dropping to around -6°C (21°F).

Data source: Temperature data for Sasayama generated using information from the Copernicus Climate Change Service.

January Precipitation in Sasayama

In Sasayama in January, the precipitation amount is 46 mm (1.8 in) over the course of 7 days.

January Precipitation Trends in Sasayama

The chart displays monthly precipitation patterns in Sasayama, with values for each month alongside January’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how January’s conditions compare to those of other months. In Sasayama, January typically receives around 46 mm (1.8 inches) of precipitation spread over approximately 7 days.

Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

January Humidity in Sasayama

In Sasayama in January, humidity is 82%. With an average temperature of 4°C (40°F), this humidity feels like a chilly dampness that lingers in the air, making travel slightly uncomfortable as the cold penetrates through layers of clothing, often leaving you feeling chilled and clammy.

January Average Humidity in Sasayama

This chart illustrates the average monthly humidity levels in Sasayama, with January’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In January, average humidity in Sasayama is approximately 82%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for January generated using information from the Copernicus Climate Change Service.

January UV Index in Sasayama

In Sasayama in January, the maximum UV index reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Sasayama for better planning.

Maximum UV Index Levels in Sasayama for January

The chart shows the monthly maximum UV Index (UVI) for Sasayama in January, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In January, the maximum UV index in Sasayama typically reaches 4, which falls under the moderate exposure category.

Data source: Sasayama January UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

Extreme (11+): Avoid the sun, stay in shade.
Very High (8-10): Limit sun exposure.
High (6-7): Use SPF 30+ and protective clothing.
Moderate (3-5): Midday shade recommended.
Low (0-2): No protection needed.

How January Weather in Sasayama Compares to Other Months

Weather in Sasayama varies notably across the year, with each month offering distinct climate conditions. This page compares January’s weather to other months in Sasayama, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Sasayama, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	4°C (40°F)	46 mm (1.8 inches)	82%	moderate
February Weather	5°C (41°F)	59 mm (2.3 inches)	79%	high
March Weather	9°C (49°F)	111 mm (4.4 inches)	74%	very high
April Weather	13°C (56°F)	141 mm (5.6 inches)	76%	very high
May Weather	19°C (66°F)	140 mm (5.5 inches)	83%	extreme
June Weather	22°C (72°F)	147 mm (5.8 inches)	87%	extreme
July Weather	26°C (79°F)	327 mm (12.9 inches)	93%	extreme
August Weather	28°C (82°F)	223 mm (8.8 inches)	91%	extreme
September Weather	23°C (75°F)	205 mm (8.1 inches)	87%	very high
October Weather	18°C (65°F)	230 mm (9.1 inches)	85%	high
November Weather	12°C (54°F)	43 mm (1.7 inches)	83%	moderate
December Weather	6°C (44°F)	60 mm (2.4 inches)	83%	moderate